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  Color image forming apparatusRelated Patent Categories: Radiation Imagery Chemistry: Process, Composition, Or Product Thereof, Color Imaging ProcessThe Patent Description & Claims data below is from USPTO Patent Application 20070160939. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention generally relates to color image forming apparatuses, and more specifically, to a color image forming apparatus such as a copier, printer, or facsimile, having a function for correcting positional error of a written image. [0003] 2. Description of the Related Art [0004] Conventionally, in an image forming apparatus configured to form images in color, a color image is formed by overlapping plural basic color images. Because of this, in order to overlap the basic color images on a recording medium precisely, positions of basic color images should be adjusted. A state where the positions of the basic color images are not adjusted but are shifted is called positional error. Due to generation of the positional error at the basic color images, color shifting is generated at the overlapped image. [0005] In order to prevent the color shift, a mark for detecting the positional error of each of the basic colors is formed at an intermediate transferring medium and a position of the mark is detected so that whether the positional shift is generated is detected. [0006] Techniques whereby the color shifting is prevented by correcting the position of the image of each of the basic colors when the positional error is generated are discussed in, for example, Japanese Laid-Open Patent Application Publication No. 2003-337456 and Japanese Laid-Open Patent Application Publication No. 2005-31263. [0007] More specifically, Japanese Laid-Open Patent Application Publication No. 2003-337456 describes that, for the purpose of stabilization of the color shifting, a proper offset value whereby a color shifting amount with time is made minimum until next color shifting correction control time is added to a correction value so that writing start position or scanning width in a main scanning direction and writing start position in a sub-scanning direction are corrected. [0008] In the technique of Japanese Laid-Open Patent Application Publication No. 2003-337456, while the color shifting is stabilized, it takes time for control for correcting the color shifting and therefore down time may be generated. SUMMARY OF THE INVENTION [0009] Accordingly, embodiments of the present invention may provide a novel and useful color image forming apparatus solving one or more of the problems discussed above. [0010] More specifically, the embodiments of the present invention may provide a color image forming apparatus whereby down time can be avoided at the time of correcting color shifting. [0011] One aspect of the present invention may be to provide a color image forming device, including: an optical scanning part; an image carrier where a latent image is formed by the optical scanning part; a developing part configured to develop the latent image of the image carrier; an endless belt configured to move so as to come in contact with the image carrier where the developed image is formed; an environment detection part provided at least at one of the optical scanning part, the image carrier, the developing part, and the endless belt, the environment detection part being configured to obtain environmental data; and a control part configured to implement positioning control based on the environmental data from the environment detection part. [0012] In embodiments of the present invention discussed below, the optical scanning part corresponds to an optical beam scanning device 30; an image carrier corresponds to photosensitive body drums 14Y, 14M, 14C, and 14K and a photosensitive body 15; a developing part corresponds to developing devices 18Y, 18M, 18C, and 18K; an endless belt corresponds to an intermediate transferring belt 13; an environment detection part correspond to an environment sensor 101; a control part corresponds to a CPU 103; and storage parts corresponds to memories 102 and 120. [0013] According to the above-mentioned image color forming apparatus, an amount of positional error due to change of environment outside the apparatus is estimated for every component so that the amount of the positional error is made functional and calculated, and thereby positioning is done at real time. Hence, it is possible to avoid down time. [0014] Other objects, features, and advantages of the present invention will be come more apparent from the following detailed description when read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0015] FIG. 1 is a schematic view showing a structure of an image forming apparatus of an embodiment of the present invention; [0016] FIG. 2 is a plan view showing a structure of an optical writing device of the image forming apparatus shown in FIG. 1; [0017] FIG. 3 is a block diagram showing a basic structure of a positional error correction device; [0018] FIG. 4 is a block diagram showing a first example of a writing part; [0019] FIG. 5 is graph showing change of an amount of positional error for change of a value of environmental data ((a) shows change of an amount of positional error for change in temperature of an intermediate transferring belt; (b) shows change of an amount of positional error for change in humidity of an intermediate transferring belt; (c) shows change of an amount of positional error for change in temperature of an optical beam scanning device; and (d) shows change of an amount of positional error over time when the image forming apparatus is continuously operated.); [0020] FIG. 6 is a block diagram showing another basic structure of the positional error correction device; [0021] FIG. 7 is a block diagram showing a second example of the writing part; Continue reading... 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